Unison device for printing-telegraphs



(No Model.)

L. A. MCCARTHY.

UNISON DEVICE FOR PRINTING TELBGRAPHS.

Patented June 2, 1 885.

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LAXVRENCE A. MCCARTHY, OF BROOKLYN, NEW YORK.

UNIS ON DEVICE FOR PRiNTlNG TELEGRAPi-lS.

SPECIFICATION forming part of Letters Patent No, 319,001, dated June 2, 1885.

Application filed January 19, 1885. (No Ul'ldGl.)

To all whom it 72mg concern.-

Be it known that I, LAWRENCE A. DICCAR- THY, a citizen of the United States, and a resident of the city of Brooklyn, in the county of Kings and State of New York, have invented certain new and useful Improvements in Printing-Telegraph Instruments, of which the following is a specification.

My invention relates,in a two-wire printingtelcgraph, to an improved unison device cousisting of an electromagnet with a movable core, which operates in conjunction with a notched disk fastened on the typewheel shaft.

The object of my improvement is to stop the type-wheels of all the printing-instruments in a circuit at a given point, so that they will all print alike when in operation. I attain this object in the following manner: In atwo-wire printingtelegraph instrument containing two type-wheels and an escapement-wheel on the same shaft rotated by mechanical means, escapement-maguets in one circuit actuating an escapement-lever and causing a step-by-step motion of the type-wheels, and in asecond circuit polarized elect-ro-magnets each actuating a printing-lever to print from one or the other type-wheel, according to the polarity of the current sent through this circuit, I place in this second circuit, for the purpose of stopping the type-wheels at a certain point, a neutra-l magnet with a sliding core, which, when actuated by a current, presses into a notch in a disk fastened on the type-wheel shaft.

I illustrate a printing-instrument containing my improvements in the accompanying drawings, in which Figure 1 represents the several parts de scribed, their connections and relation to each other. Fig. 2 shows the neutral magnet with its movable core, its retractile spring, and the disk said core acts on.

Referring to Fig. 1, magnets A A represent escapeinentmagnets in circuit a. These magnets control escapement-lever G by acting on armature g, and thereby escapement-wheel E, type-wheels T T, and disk D, which are fastened to the same shaft.

In the circuit 0 magnets B B represent polarized magnets for actuating the printing-levers b and I). Said levers are journaled in the The repermancnt magnets M M at J J.

tractilc springs r 1- hold the printinglevers Z) Z) away from the typewheels T T when the weaker current charges the unison-magnet O, or when no current passes through the circuit 0. In the circuit 0 is also the neutral magnet O, the end h of the movable core (I of which presses into notch n in disk D, when a current is passed through circuit 0, and the type-wheels are allowed to revolve until the notch in disk D comes opposite to core at. Spring R draws core d away from disk D as soon as the current is broken in circuit 0, thereby allowing the type-wheels to rotate. While a strong current in circuit 0 actuates one or the other of the polarized magnets 13 or 13, and thereby printing-lever Z) or I), according to the polarity of the current, magnet 0 answers to either polarity, and also answers to a weaker current, one that will not enable magnets B and B to attract levers Z) and b, because the retractingsprings r and 1" are adjusted so that levers b b can only respond to stronger currents. When the magnet G responds to a steady weak current, the core (I is pressed against the outer edge of disk D and into the notch a when it reaches a position in front of the end of said core, and thereby stops the Wheels on the typewheel shaft S.

Fig. 2 shows my neutral unison-magnet G, consisting of a helix with its movable core 02. Said core is preferably wedge-shaped at the end marked h, so as to fit readily into the notch a, of the same shape, in disk D, and therebystop the type -wheels at a predetermined point when a weak current is passed through the coils of said magnet.

It is obvious that the shape of the core and disk may be varied.

lVhat I claim as new, and desire to secure by Letters Patent, is-

1. In a printing-telegraph instrument wherein the escapement-magnets are in one circuit, controlling type-wheels and an escapementwheel fixed on the same shaft, and in a second circuit are polarized magnets, each responding to a current opposite in polarity to the other for actuating the printing-levers, a unison device consisting of a neutral magnet placed in said second circuit, said magnet constructed with a sliding core and its retractile spring, together with a disk notched to receive the end of said core, fastened to the same shaft combination ofa unison-magnet having a sliding core with a notched disk fastened to the type-wheel shaft, all substantially as shown.

In testimony that I claim the foregoing as my invention I have signed my name, in presence of two witnesses, this 16th day of January, 1885.

LAWRENCE MCCARTHY,

Vitnesses:

WILLIAM Y. KELLY, F. H. LAWRENCE 

